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Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73–033933.0

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Pala, Anna F., Gänsicke, B. T. (Boris T.), Marsh, Tom, Breedt, E., Hermes, J. J., Landstreet, J. D., Schreiber, M. R., Townsley, D. M., Wang, L., Aungwerojwit, A. et al.
(2019) Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73–033933.0. Monthly Notices of the Royal Astronomical Society, 483 (1). pp. 1080-1103. doi:10.1093/mnras/sty3174 ISSN 1745-3933.

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Official URL: http://dx.doi.org/10.1093/mnras/sty3174

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Abstract

We present high-time-resolution photometry and phase-resolved spectroscopy of the short-period (⁠Porb=80.52min⁠) cataclysmic variable SDSS J123813.73–033933.0, observed with the Hubble Space Telescope (HST), the Kepler/K2 mission, and the Very Large Telescope (VLT). We also report observations of the first detected superoutburst. SDSS J1238–0339 shows two types of variability: quasi-regular brightenings recurring every ≃8.5  h during which the system increases in brightness by ≃0.5mag, and a double-hump quasi-sinusoidal modulation at the orbital period. The detailed K2 light curve reveals that the amplitude of the double-humps increases during the brightenings and that their phase undergoes a ≃90° phase shift with respect to the quiescent intervals. The HST  data unambiguously demonstrate that these phenomena both arise from the heating and cooling of two relatively large regions on the white dwarf. We suggest that the double-hump modulation is related to spiral shocks in the accretion disc resulting in an enhanced accretion rate heating two localized regions on the white dwarf, with the structure of the shocks fixed in the binary frame explaining the period of the double humps. The physical origin of the 8.5  h brightenings is less clear. However, the correlation between the observed variations of the amplitude and phase of the double-humps with the occurrence of the brightenings is supportive of an origin in thermal instabilities in the accretion disc.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): White dwarf stars, Accretion (Astrophysics)
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: 11 February 2019
Dates:
DateEvent
11 February 2019Published
23 November 2018Available
14 November 2018Accepted
Volume: 483
Number: 1
Page Range: pp. 1080-1103
DOI: 10.1093/mnras/sty3174
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record A F Pala, B T Gänsicke, T R Marsh, E Breedt, J J Hermes, J D Landstreet, M R Schreiber, D M Townsley, L Wang, A Aungwerojwit, F–J Hambsch, B Monard, G Myers, P Nelson, R Pickard, G Poyner, D E Reichart, R Stubbings, P Godon, P Szkody, D De Martino, V S Dhillon, C Knigge, S G Parsons; Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73–033933.0, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 1, 11 February 2019, Pages 1080–1103, https://doi.org/10.1093/mnras/sty3174 is available online at: https://doi.org/10.1093/mnras/sty3174
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 4 February 2019
Date of first compliant Open Access: 4 February 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
NAS 5–26555[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
320964 (WDTracer)Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
NAS5-26555[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
UNSPECIFIED[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
1181404[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
R2560B149National Research Council of Thailandhttp://dx.doi.org/10.13039/501100004704

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